Speaker



FIG. 1 is a front view of the speaker in accordance with the present design;

FIG. 2 is a back view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is the opposite side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines are used to illustrate portions of the speaker that form no part of the claimed design. 

CLAIM The ornamental design for a speaker, as shown and described. 